W: (v) interfere [Related to: interference] (get involved, so as to alter or hinder an action, or through force or threat of force) "Why did the U.S. not intervene earlier in WW II?"
S: (n) interposition, intervention (the act or fact of interposing one thing between or among others)
S: (n) intervention ((law) a proceeding that permits a person to enter into a lawsuit already in progress; admission of person not an original party to the suit so that person can protect some right or interest that is allegedly affected by the proceedings) "the purpose of intervention is to prevent unnecessary duplication of lawsuits"
S: (n) treatment, intervention (care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury))